이라던데

I hear that ..., apparently ...

→ 이다
이 to be + 라던데 reported-speech ending
auxiliary Rare #27,314
I hear that ..., apparently ... A conversational form used to report something the speaker has heard, often while inviting a response or checking whether it is true.
KO: 민수가 학생이라던데, 맞아요?
EN: I hear Minsu is a student. Is that right?
Conjugation of 이다

톰 누가 찾아왔어 자기가 리버풀 부두의 왕 이라던데

Tom, someone came looking for you. He said he was the king of the Liverpool docks.

— 피키 블라인더스: 불멸의 남자 (2026)